| sylur | Silurian |
| Sylvain Charles Valée | Sylvain Charles Valée |
| Sylvain Julien Victor Arend | Sylvain Julien Victor Arend |
| Sylvain Wiltord | Sylvain Wiltord |
| Sylvester Stallone | Sylvester Stallone |
| Sylvia Beach | Sylvia Beach |
| Sylvia Kristel | Sylvia Kristel |
| Sylvia Plath | Sylvia Plath |
| Sylvia Saint | Silvia Saint |
| Sylvie Becaert | Sylvie Becaert |
| Sylvie Vartan | Sylvie Vartan |
| Sylvinho | Sylvinho |
| Sylvius Leopold Weiss | Sylvius Leopold Weiss |
| sylwanit | sylvanite |
| sylwester | New Year's Eve |
| Sylwester I | Pope Sylvester I |
| Sylwester Szmyd | Sylwester Szmyd |
| sylwetka | figure |
| Sylwia | Silvia |
| Sylwia Sommerlath | Queen Silvia of Sweden |
| Sylwiusz | Silvius |
| Symantec | Symantec |
| Symbian | Symbian OS |
| symbioza | symbiosis |
| symbol | symbol |
| Symbol giełdowy | Ticker symbol |
| Symbol Jacobiego | Jacobi symbol |
| Symbol Kroneckera | Kronecker delta |
| Symbol Leviego-Civity | Levi-Civita symbol |
| Symbol narodowy | National symbol |
| Symbol solarny | Solar symbol |
| Symbol terminalny | Terminal and nonterminal symbols |
| Symbole kwiatowe | Language of flowers |
| Symbole religijne | Religious symbolism |
| symbolicznie | symbolically |
| symboliczny | symbolic |
| Symbolika anarchistyczna | Anarchist symbolism |
| Symbolika chemiczna | Chemical formula |
| Symbolika faszystowska | Fascist symbolism |
| symbolizować | symbolize |
| Symeon | Simeon |
| Symeon I | Simeon I of Bulgaria |
| Symeon II | Simeon Saxe-Coburg-Gotha |
| Symetria fizyczna | Symmetry in physics |
| Symetria osiowa | Reflection symmetry |
| Symetria złamana | Spontaneous symmetry breaking |
| Symetrodonty | Symmetrodonta |
| Symferopol | Simferopol |
| symfonia | symphony |
| Symfonia fantastyczna | Symphonie fantastique |
| Symfonia zmysłów | Flesh and the Devil |
| Symfonie | List of symphonies by name |
| Symlink race | Symlink race |
| Symmachus | Pope Symmachus |
| Symmetric High-speed Digital Subscriber Line | Single-Pair High-speed Digital Subscriber Line |
| Symon Petlura | Symon Petliura |
| symonia | simony |
| Symonides | Simonides |
